Sets the alignment of the widget.
Use Widget's alignment (GtkWidget:halign and GtkWidget:valign) and margin properties or Label's xalign and yalign properties.
GtkWidget:halign
GtkWidget:valign
a Misc.
the horizontal alignment, from 0 (left) to 1 (right).
the vertical alignment, from 0 (top) to 1 (bottom).